From eeb0a660244d28067d92660bd4bde598d64805b5 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@localhost>
Date: Wed, 20 Apr 2011 13:19:06 +0000
Subject: 9boot: oops, it all was just a20 gate not being enabled

---
 sys/src/boot/pc/a20.s |  8 ++++++++
 sys/src/boot/pc/pxe.c | 10 ++++++++--
 sys/src/boot/pc/sub.c | 17 ++---------------
 3 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/sys/src/boot/pc/a20.s b/sys/src/boot/pc/a20.s
index 53b7af5cb..0455a5952 100644
--- a/sys/src/boot/pc/a20.s
+++ b/sys/src/boot/pc/a20.s
@@ -14,6 +14,14 @@ TEXT a20(SB), $0
 _biosfail:
 	CALL16(pmode32(SB))
 
+	/* fast a20 */
+	MOVL $0x92, DX
+	INB
+	ANDB $0xFE, AX
+	ORB $0x02, AX
+	OUTB
+
+	/* slow a20 */
 	CALL a20wait(SB)
 	MOVL $0x64, DX
 	MOVB $0xAD, AL
diff --git a/sys/src/boot/pc/pxe.c b/sys/src/boot/pc/pxe.c
index 5fefd72b0..a950b2579 100644
--- a/sys/src/boot/pc/pxe.c
+++ b/sys/src/boot/pc/pxe.c
@@ -113,8 +113,14 @@ unload(void)
 		uchar status[2];
 		uchar junk[10];
 	} buf;
-	memset(&buf, 0, sizeof(buf));
-	pxecall(0x70, &buf);
+	static uchar shutdown[] = { 0x05, 0x070, 0x02, 0 };
+	uchar *o;
+
+	for(o = shutdown; *o; o++){ 
+		memset(&buf, 0, sizeof(buf));
+		if(pxecall(*o, &buf))
+			break;
+	}
 }
 
 static int
diff --git a/sys/src/boot/pc/sub.c b/sys/src/boot/pc/sub.c
index 40a77fd3b..02d75aed5 100644
--- a/sys/src/boot/pc/sub.c
+++ b/sys/src/boot/pc/sub.c
@@ -212,30 +212,17 @@ bootkern(void *f)
 	if(beswal(ex.magic) != I_MAGIC)
 		return "bad magic";
 
-	/* load address */
 	e = (uchar*)(beswal(ex.entry) & ~0xF0000000UL);
-
-	/*
-	 * the kernels load addess (entry) might overlap
-	 * with some bios memory (pxe) that is needed to load
-	 * it. so we read it to this address and after
-	 * we finished, move it to final location.
-	 */
-	t = (uchar*)0x200000;
-
+	t = e;
 	n = beswal(ex.text);
 	if(readn(f, t, n) != n)
 		goto Error;
-	d = t + ((uchar*)PGROUND((ulong)e + n) - e);
+	d = (uchar*)PGROUND((ulong)t + n);
 	n = beswal(ex.data);
 	if(readn(f, d, n) != n)
 		goto Error;
 	close(f);
-
 	unload();
-
-	n = (d + n) - t;
-	memmove(e, t, n);
 	jump(e);
 Error:		
 	return "i/o error";
-- 
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